fix: grouped barchart not displaying second bar if y is the same (#28)

library/src/main/java/com/dzeio/charts/Entry.kt

@@ -1,10 +1,13 @@
 package com.dzeio.charts
 
+import com.dzeio.charts.series.SerieInterface
+
 /**
  * A Base entry for any charts
  */
 data class Entry(
     var x: Double,
     var y: Float,
-    var color: Int? = null
+    var color: Int? = null,
+    var serie: SerieInterface? = null
 )

library/src/main/java/com/dzeio/charts/axis/XAxis.kt

@@ -52,7 +52,7 @@ class XAxis(
     }
 
     override fun getPositionOnRect(entry: Entry, drawableSpace: RectF): Double {
-        val result = drawableSpace.width() * (entry.x - x) / getDataWidth()
+        val result = drawableSpace.left + drawableSpace.width() * (entry.x - x) / getDataWidth()
         if (view.type == ChartType.GROUPED) {
             val serie = view.series.find { it.entries.contains(entry) }
             val index = view.series.indexOf(serie)

library/src/main/java/com/dzeio/charts/series/BarSerie.kt

@@ -65,7 +65,7 @@ class BarSerie(
             // calculated height in percent from 0 to 100
             var top = view.yAxis.getPositionOnRect(entry, drawableSpace)
                 .coerceIn(drawableSpace.top, drawableSpace.bottom)
-            var posX = drawableSpace.left + view.xAxis.getPositionOnRect(
+            var posX = view.xAxis.getPositionOnRect(
                 entry,
                 drawableSpace
             ).toFloat()

library/src/main/java/com/dzeio/charts/series/BaseSerie.kt

@@ -25,6 +25,12 @@ sealed class BaseSerie(
     override var yAxisPosition: YAxisPosition = YAxisPosition.RIGHT
 
     override var entries: ArrayList<Entry> = arrayListOf()
+        set(values) {
+            for (value in values) {
+                value.serie = this
+            }
+            field = values
+        }
 
     override fun getDisplayedEntries(): ArrayList<Entry> {
         val minX = view.xAxis.x

library/src/main/java/com/dzeio/charts/series/LineSerie.kt

@@ -68,9 +68,10 @@ class LineSerie(
                 entriesCurrentY[entry.x]!!.value = top
             }
 
-            val posX = (drawableSpace.left +
-                    view.xAxis.getPositionOnRect(entry, drawableSpace) +
-                    view.xAxis.getEntryWidth(drawableSpace) / 2f).toFloat()
+            val posX = (
+                view.xAxis.getPositionOnRect(entry, drawableSpace) +
+                view.xAxis.getEntryWidth(drawableSpace) / 2f
+            ).toFloat()
 
             // handle color recoloration
             val paint = Paint(linePaint)